Cluster structure and isoscalar monopole excitation in light nuclei

10th International Conference on Clustering Aspects of Nuclear Structure and Dynamics

Yamada, T.^1

Laboratory of Physics, Kanto Gakuin University, Yokohama 236-8501, Japan^1

关键词: Closed shells;    Cluster state;    Cluster structure;    Ground-state correlation;    Lower energies;    Monopole excitations;    Single particle;    Strength function;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/436/1/012008/pdf
DOI  :  10.1088/1742-6596/436/1/012008

来源: IOP

【 摘 要 】

Isoscalar monopole excitation to cluster states in light nuclei is in general strong as to be comparable with the single particle strength and shares about 20 % of the sum rule value. In the present paper, the isoscalar monopole strength function in16O is discussed up to Ex 40 MeV as a typical example. We found that 1) two different types of monopole excitations exist in16O; one is the monopole excitation of cluster states which is dominant in the lower energy part, and the other is the monopole excitation of the mean-field type such as one-particle one-hole (1p1h) which is attributed mainly to the higher energy part, 2) this character of the monopole excitations originates from the fact that the ground state of16O with the dominant doubly closed shell structure has a duality of the mean-field-type as well as alpha-clustering character, and 3) the monopole strength is much enhanced by the α-type ground state correlation.